|
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO | AUTHOR | RESOURCES | COPYING | NOTES | COLOPHON |
TRACE-CMD-SNAPSHOT(1) TRACE-CMD-SNAPSHOT(1)
trace-cmd-snapshot - take, reset, free, or show a Ftrace kernel
snapshot
trace-cmd snapshot [OPTIONS]
The trace-cmd(1) snapshot controls or displays the Ftrace Linux
kernel snapshot feature (if the kernel supports it). This is useful
to "freeze" an instance of a live trace but without stopping the
trace.
trace-cmd start -p function
trace-cmd snapshot -s
trace-cmd snapshot
[ dumps the content of buffer at 'trace-cmd snapshot -s' ]
trace-cmd snapshot -s
trace-cmd snapshot
[ dumps the new content of the buffer at the last -s operation ]
-s
Take a snapshot of the currently running buffer.
-r
Clear out the buffer.
-f
Free the snapshot buffer. The buffer takes up memory inside the
kernel. It is best to free it when not in use. The first -s
operation will allocate it if it is not already allocated.
-c cpu
Operate on a per cpu snapshot (may not be fully supported by all
kernels)
-B buf
If a buffer instance was created, then the -B option will operate
on the snapshot within the buffer.
trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1),
trace-cmd-start(1), trace-cmd-extract(1), trace-cmd-reset(1),
trace-cmd-split(1), trace-cmd-list(1), trace-cmd-listen(1)
Written by Steven Rostedt, <rostedt@goodmis.org[1]>
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git
Copyright (C) 2010 Red Hat, Inc. Free use of this software is granted
under the terms of the GNU Public License (GPL).
1. rostedt@goodmis.org
mailto:rostedt@goodmis.org
This page is part of the trace-cmd (a front-end for Ftrace) project.
Information about the project can be found at [unknown -- if you
know, please contact man-pages@man7.org] If you have a bug report for
this manual page, send it to Steven Rostedt <rostedt@goodmis.org>.
This page was obtained from the project's upstream Git repository
⟨git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git⟩
on 2017-07-05. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-to-
date source for the page, or you have corrections or improvements to
the information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
12/17/2015 TRACE-CMD-SNAPSHOT(1)